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Math·Advanced Math·Equivalent expressions

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$$\begin{gathered} r(x)=12(x-2) \\ s(x)=x^3+n{x}^2+2nx+8 \end{gathered}$$
For the given functions $r$ and $s$, $n$ is a constant. If $r(x)\cdot s(x)=12(x^4-16)$, what is the value of $n$?

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